What is the potential energy of raising a 1.0 kg mass 2.0 meters into the air? How fast will hit the floor, using conservation of energy? O a) 9.8 J and 4.4 m/s O b) 19.6 J and 4.4 m/s O c) 19.6 J and 6.3 m/s O d) 39.2 J and 6.3 m/s